That being said, I can say that I watched a streamer play the game late last night that has never played D&D and the 50ish people that were in chat had to explain to him how spell slots worked along with some other things. End result? He absolutely LOVED the game due to it's intricacy.
To my mind this means the UI needs to be A LOT better - both in regards to tool tips, showing your ability score modifiers next to the actual ability scores as you increase them, making you guterally understand the choices you're making upon level up etc... then you you don't get this effect (watch the first 35 seconds):
https://www.youtube.com/watch?v=P8A7qDItsGM 
